Novel Ribbon-Shaped α-Al2O3 Fibers

Abstract

The use of Al2O3 polycrystalline fibers and whiskers as strengtheners in high‐temperature composites is of great interest owing to their high elastic modulus and their thermal and chemical stability. The authors describe in this communication a novel type of crystalline α‐Al2O3 fiber. These new fibers—termed ribbons by the authors—have a high specific surface area, which, together with their optical properties and low cost, makes them suitable for use as protective films in composites and as crystalline surfaces for other α‐Al2O3 fiber production methods.

Hydrothermal synthesis of alumina nanotubes templated by anionic surfactant

“…Most recently, considerable efforts have been directed towards the preparation of nano-structured alumina, due to their novel properties, such as high elastic modulus, thermal and chemical stability, and optical characteristics [14]. Up to date, nanosized Al 2 O 3 with different morphologies, such as nanotubes [8,17 -21], nanowires [22], nanobelts [22], nanofibers [23,24], rod-shaped nanoparticles [25] and whiskers [26], has been synthesized by a variety of routes. However, there has been no report on the formation of nanotubular alumina in the presence of the anionic surfactant, sodium dodecyl sulfonate (SDS), as structure-directing agent.…”

Synthesis of Alumina Nanofibers and Composites

“…Many of the nanfibers have been produced using hydrothermal treatment, with or without surfactant, [18][19][20][21][22][23][24][25] and sol-gel [17,27] techniques of various alumina precursors, subsequent calcinations dehydrate the solid from the sol-gel solution produced by the hydrothermal process. The solid, which consists of naonfibrous boehmite, may be calcined to obtain thealumina nanofibers.…”

“…The size and morphology of aluminum hydrate nanoparticles synthesized by these processes can be controlled by manipulating the pH value of the reaction mixture, the hydrothermal temperature and aging time, the solvent and the surfactant used. [2,3,[20][21][22][23][24][25][26][27] …”

Growth and mechanism of one-dimensional Al2O3 nanostructures grown by chemical vapor deposition from an Al powder source

“…Microstructural design is needed to overcome their brittleness; one-dimensional ceramic (1D) nanostructures show high elastic modulus, in contrast to bulk ceramic [1]. 1D nanostructures, such as whiskers, nanowires, nanotubes, and nanobelts, have been studied due to their distinct structures and useful properties for applications in mechanical, optical, and electronic fields [2][3][4].…”